Apex domains cannot have CNAME records.
Question and response
Question
dig frmug.org. NS
Answer
frmug.org. 5 NS ns.frmug.org.
frmug.org. 5 NS ns.eu.org.
frmug.org. 5 NS tms.frmug.org.
Authority
The response has no authority records.
Additional
ns.frmug.org. 5 A 213.36.253.97
tms.frmug.org. 5 A 37.187.120.58
tms.frmug.org. 5 AAAA 2001:41d0:a:f13a:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0